Ah, OK. I'm not that familiar with the Bitbox or the Robaux, but they look fairly powerful.
For ambient sounds, I would probably be looking at adding more random modulation like a Triple Sloths and a sample and hold, or something similar. Marbles may be another good addition, but Bloom might achieve some of the same things as Marbles. A way to mix CV signals, like the Happy Nerding 3xMIA, would probably be a fun addition.
I also like low pass gates a lot for plucky percussive sounds. They can be fairly inexpensive and can act sort of like a filtered VCA. A nice wavfeolder could give you a new range of tones too.
I also live in a place where there aren't many people interested in synths. Not even my friends... haha.
Welcome to MG! Have fun and good luck.